Security Device with a zero-order diffractive microstructure
US8441727B2 · kind B2 · utility
1Cited by
2References
18Claims
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Key dates
| Filing date | Aug 21, 2012 |
| Grant date | May 14, 2013 |
| Priority date | — |
| Expiry date | Aug 21, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/22
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A security Device comprises a zero order diffractive microstructure (5) buried within a substrate (3). One or more further optical structures, such as microlenses (1), may be formed on a surface (2) of the substrate (3). The further optical structures modify the optical characteristics of the zero order diffractive microstructure (5).Various alternatives or additional optical structures and methods of producing them are described in additional embodiments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.